Features - Omron K7GE-MG User Manual

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Features

The following features make the K7GE-MG convenient and safe to use.
Uses the Same Detection Principle as a Megohmmeter
The K7GE-MG measures the insulation
resistance by the same detection principle
(Megger method) as a Megohmmeter. Therefore,
the inspection data of the Megohmmeter can be
used, and the smooth introduction of this system
is possible.
More Support for the Safety Functions
•
The K7GE-MG is always monitoring the OFF state of the loads and the power line. K7GE-MG does
not start measurement even if it receives a measurement start signal during load operation. In
addition, K7GE-MG will stop the measurement immediately if the load restarts during the
measurement.
•
In addition, the K7GE-MG is
equipped with an overcurrent
limit circuit.
This limits the following
overcurrents to safe levels:
- Instantaneous overcurrent
that flows when the load is
restarted during
measurement.
- Overcurrent that flows when
the insulation resistance
value is extremely low.
•
To reduce equipment damage
and prevent electric shock, the
K7GE-MG has a low Megger
voltage of 50 VDC*.
* Even if the Megger voltage is 50 VDC, it does not affect the measurement accuracy.
•
The K7GE-MG provides a contact output that indicates that measurement is in progress. You can
design an interlock circuit that prevents the load from restarting during the measurement.
Insulation Resistance Monitoring Device User's Manual (N224)
Megohmmeter
Turn OFF
Auxiliary
MC MC-a
contact OFF
Interlock
Status output
measurement
Note The above diagram shows only the parts of the internal circuit of the K7GE-MG that are
necessary for explanation.
1 Overview
Megger method
K7GE-MG
K7GE-MG
L2
L3
monitoring
during
Current Overcurrent
limiter prevention
Megger voltage
(50 VDC)
PE
1
Disconnection
Voltage
(turn OFF)
monitoring
Disconnection
(turn OFF) OK
Start measurement
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